The Strange Reason Whales Sing in Patterns Like Music

Why Sound Dominates Life Underwater

The ocean is not naturally silent. Waves, rain, shifting ice, earthquakes, snapping shrimp, fish and marine mammals all contribute to its soundscape. For whales, sound is especially valuable because seawater often limits vision. Sunlight is quickly scattered or absorbed, and darkness dominates most of the ocean’s depth.

Sound behaves differently. It travels through seawater at roughly 1,500 metres per second—more than four times its speed in air—and low-frequency sounds can remain detectable across considerable distances under suitable conditions. This gives whales a way to exchange information even when they cannot see one another.

Whales use a wide range of vocal behaviour. Calls may help individuals maintain contact, coordinate activity, identify one another or respond to social situations. Toothed whales such as dolphins and sperm whales can also produce echolocation clicks, but humpback song is different: it is a patterned social display rather than an echolocation system.

What Scientists Mean by a Whale “Song”

Not every whale sound is a song. Researchers reserve that term for vocal sequences with recognizable organization and repetition. Humpback whale song is one of the clearest examples because it is built in layers, somewhat like a composition assembled from notes, motifs and sections.

A singer normally moves through the themes in a predictable order before beginning again. One complete cycle may last several minutes, while the whale can repeat the performance for a much longer period. The result is structured, but it is not fixed like a studio recording. Small changes accumulate as the breeding season progresses.

Who Sings—and Who Can Hear It?

In humpback whales, the elaborate songs studied on breeding grounds are produced by males. Females, calves and males also make other social sounds, so being a nonsinger does not mean being silent. The song itself, however, appears closely connected to the male reproductive display system.

Males within the same breeding population usually perform broadly the same current version. They do not simply preserve one song throughout life. Instead, singers continuously match changes spreading through the population, indicating that much of the pattern is learned socially rather than inherited as an unchangeable genetic program.

A whale does not need to be directly beside another singer to hear it. Powerful low-frequency components can travel across kilometres of water, although transmission distance varies with depth, seafloor shape, temperature, background noise and the sound’s frequency.

Why Do Male Humpbacks Sing?

Song activity becomes especially prominent around winter breeding areas, making sexual selection the leading scientific explanation. Yet identifying a reproductive role is easier than determining exactly how the display influences mating.

Calling song a “love song” makes a memorable headline, but it oversimplifies the evidence. Researchers have observed singers interacting with other males as well as joining groups that include females. The display may therefore communicate with multiple audiences.

An Underwater Tradition That Continually Evolves

Perhaps the most remarkable feature of humpback song is that it behaves like culture. In biology, culture refers to information or behaviour acquired through social learning and shared within a group. It does not require books, schools or human-style institutions.

In many humpback populations, the shared song changes gradually. A sound may be altered, a phrase may shift or a theme may be replaced. Singers adopt those modifications with considerable accuracy, producing a population-wide version that continues to evolve.

South Pacific researchers have also documented dramatic “song revolutions.” During these events, a substantially different song originating in one population spreads into neighbouring populations and replaces the previous version. Some song types have travelled eastward across large parts of the region through a chain of cultural transmission.

Are Whale Songs a Form of Music?

From a human perspective, humpback songs sound musical because they contain rhythm, repetition, variation, tonal movement and recognizable organization. Describing them as music can be a useful comparison, provided it does not replace scientific caution.

Music is partly a human cultural category. Researchers can measure the acoustic structure of a whale’s performance, but they cannot yet ask the singer whether it experiences melody, beauty or creative satisfaction. Calling the performance “art” is therefore a philosophical interpretation rather than a demonstrated biological conclusion.

How Can a Whale Produce Such Complex Sounds?

Whales do not sing by opening their mouths and exhaling streams of bubbles. Baleen whales have specialized structures in the larynx—the organ often called the voice box—that allow tissue to vibrate and generate sound while air is recycled within the respiratory system.

Research published in 2024 provided direct experimental evidence that baleen-whale larynges contain evolutionary adaptations capable of producing their characteristic low-frequency calls. This mechanism is different from simply describing whale anatomy as human vocal cords enlarged to gigantic proportions.

The sound is then shaped by the whale’s vocal tract and surrounding tissues. Changes in airflow, tissue position and resonance can help create tonal sweeps, grunts, pulses and other acoustic textures. Because the process occurs internally, a whale can vocalize underwater without inhaling water into its lungs.

Do Whale Songs Reveal Emotion?

Whales are socially complex mammals, and their sounds undoubtedly arise in meaningful behavioural contexts. Calls may occur during separation, reunion, feeding, conflict or contact between a mother and calf. That does not give scientists a reliable emotional dictionary, however.

A descending cry may sound sorrowful to a human listener, but acoustic resemblance to sad human music is not proof that the whale is experiencing sadness. The responsible approach is to combine recordings with observations of movement, companions, location and behaviour before interpreting a sound’s likely function.

This caution does not make whale communication less impressive. It makes the science more valuable by separating what can be measured from what humans naturally imagine.

When Human Noise Enters the Chorus

Whale communication evolved in an ocean already filled with natural sound, but modern marine environments also contain persistent engine noise, construction activity, seismic surveys and powerful sonar. When human-generated noise overlaps the frequencies whales use, it can produce acoustic masking—the underwater equivalent of trying to hold a conversation beside heavy machinery.

Masking may reduce the distance over which a signal can be detected. Depending on the species and circumstances, whales may call more loudly, change timing, alter frequency, leave an area or lose opportunities to hear socially important sounds. The consequences depend on the noise level, duration, distance and biological context, so not every sound source has the same effect.

Protecting whale habitat therefore involves more than preventing collisions and entanglement. It also means protecting the acoustic environment on which whales rely. Quieter ship technology, carefully planned vessel routes, speed management and restrictions on intense noise near sensitive habitats can all contribute to healthier marine soundscapes.

How Researchers Listen Without Seeing the Singer

Scientists study whale vocalizations with hydrophones—underwater microphones that can be deployed from boats, attached to floating instruments, lowered to the seafloor or incorporated into long-term monitoring networks.

Recordings are commonly displayed as spectrograms, which show how sound energy changes across frequency and time. Researchers can compare themes, follow the arrival of a new song, estimate seasonal presence and examine how whales respond to ships or other noise.

Passive acoustic monitoring is particularly useful at night, during rough weather and in remote waters where visual surveys are difficult. A hydrophone cannot answer every question—it may not identify the singer or reveal what nearby whales are doing—but when combined with tags, photographs, genetic samples and behavioural observations, it becomes a powerful conservation tool.

A Living Composition, Not a Solved Code

Humpback whale song is extraordinary precisely because it occupies the boundary between the familiar and the unknown. Its hierarchy feels musical. Its population-wide changes resemble cultural trends. Its breeding-season timing suggests sexual selection. Yet its detailed meaning remains beyond our current ability to translate.

That uncertainty should inspire curiosity rather than encourage unsupported claims. Whale songs remind us that sophisticated communication and learned traditions did not begin with humanity. Other animals have evolved their own ways of sharing information across generations and maintaining social connections through sound.

The next time the ocean appears quiet from the shore, remember that silence is largely a limitation of human hearing. Far below the surface, living signals may be moving through the water—repeated, revised and learned by animals whose acoustic world extends far beyond the horizon.